Have a 70 Doing mass questing for G, or farm whatever.
Send earned money to your toon with JC to buy items for skilling up their JC.
Send crafted rings, neckpieces to another toon- an Enchanter, to DE into items to level Enchanting, or if it is too low (like mine), sell on the AH.
Send spent/traded money back to your 70 to pay for repairs/whatever
Rinse and repeat.
Using this pattern, I make back the moeny I just spent on my JC. Figured Id share it, I dont get back ALL of what I spent, but I get back about 80% so minimal loss